- Mackinnon's Shrike
- Madagascar Green Pigeon
- Madagascar Hoopoe
- Madagascar Lark
- Madagascar Magpie-Robin
- Madagascar Wagtail
- Magellanic Oystercatcher
- Magellanic Penguin
- Magellanic Plover
- Magellanic Woodpecker
- Magnificent Frigatebird
- Magpie Shrike
- Malabar Pied Hornbill
- Malachite Kingfisher
- Malachite Sunbird
- Malagasy Bulbul
- Malagasy Kestrel
- Malagasy Kingfisher
- Malagasy Paradise Flycatcher
- Malagasy Turtle Dove
- Malaysian Pied Fantail
- Mallard
- Mangrove Swallow
- Mangrove Warbler
- Marabou Stork
- Marico Sunbird
- Marmora's Warbler
- Marsh Sandpiper
- Marsh Tit
- Martial Eagle
- Martinique Oriole
- Masked Gnatcatcher
- Masked Lapwing
- Masked Tityra
- Masked Yellowthroat
- Meadow Pipit
- Mealy Amazon
- Mediterranean Gull
- Medium Egret
- Medium Ground Finch
- Melodious Blackbird
- Melodious Warbler
- Meves's Starling
- Mexican Violetear
- Middle Spotted Woodpecker
- Mistle Thrush
- Mocking Cliff Chat
- Moltoni's Warbler
- Monk Parakeet
- Montezuma Oropendola
- Moorland Chat
- Morelet's Seedeater
- Mountain Bulbul
- Mountain Caracara
- Mountain Parakeet
- Mountain Wagtail
- Mountain Wheatear
- Mourning Collared Dove
- Mourning Dove
- Mourning Sierra Finch
- Moussier's Redstart
- Mute Swan
- Myrtle Warbler